CSI Variance Motion Detection via Router Signals
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Solution Overview
Problem
Current methods for monitoring and detecting motion events in local area networks, such as using cameras, are time-consuming, resource-intensive, and raise privacy concerns.
Innovation Solution
Utilizing channel state information (CSI) from devices connected to a router to detect motion events by analyzing the variance of CSI signals and determining the location of the event.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If camera-based systems are used for motion detection, then motion events can be detected, but time consumption and resource usage increase
Solution Approach 1:
The patent replaces camera-based mechanical/optical motion detection with a signal-processing approach using channel state information (CSI) from wireless communications. The system extracts motion events by analyzing phase variations in CSI data, substituting physical camera mechanisms with electronic signal analysis that operates faster and consumes fewer resources.
Solution Approach 2:
The patent introduces CSI as an intermediary medium for motion detection. Instead of directly using cameras to detect motion, the system uses wireless signals that naturally propagate through the environment and carry implicit motion information through phase variations. This intermediary approach enables indirect but efficient motion detection.
2Measurement precision
If camera-based systems are used for motion detection, then motion events can be detected, but network and computing resources are consumed
Solution Approach 1:
The patent makes the existing wireless communication infrastructure serve dual purposes: data transmission and motion detection. The CSI data, already collected for communication quality assessment, is repurposed for motion event detection. This self-service approach eliminates the need for separate dedicated motion detection hardware and processing resources.
Solution Approach 2:
The patent enables wireless communication signals to perform multiple functions simultaneously: maintaining network communication and detecting motion events. The CSI processing pipeline is designed to extract motion information from the same signal data used for communication, making the system multi-functional without requiring additional resources.
3Measurement precision
If camera-based systems are used for motion detection, then motion events can be detected, but privacy issues arise
Solution Approach 1:
The patent extracts only the essential motion information from wireless signals while discarding or not processing any visual or identifying data. By using CSI phase variations alone for motion detection and avoiding camera capture entirely, the system extracts minimal necessary information that does not compromise user privacy.
Data Source
AI summary
In some implementations, a first device may obtain first channel state information (CSI) of a second device. The first device may determine that a variance of the first CSI exceeds a variance threshold. The first device may determine that a motion event has occurred based on determining that the variance, of the first CSI, exceeds the variance threshold. The first device may determine a location of the motion event based on the first CSI and second CSI of a third device. The first device may adjust an operation of one or more devices associated with the location based on determining the motion event.